The second 777 sim is already here. They're putting it up as we speak in OC3. If you've ever wondered what one looks like disassembled, swing by.
I have no idea what the staffing matrix is for a sim. 16 777s requires about 512 pilots (based on 32 pilots/plane). You can round that up to 600 to included reserves and the various management types that want the rating. Do 600 pilots require more than one sim?
I agree, though, that this is a good sign we'll be adding more 777s in the future. Anderson & Co. love the airplane and the Koolaid around here is not if we exercise the options we have, but when. This also includes picking up 777s that are on the used a/c market.